It is believed that life originated on earth in its very simple form. Constant struggle of the early living beings gave rise to more and progress is evolution which led to formation of diverse life forms . Carl Worse in 1990 proposed three domains of life to classify life forms. They are Archaea, Bacteria and Eukarya. Domain is an unit larger than Kingdom in the system of classification.
Bacteria and Archaea both have prokaryotic cells where as Eukarya heve eukaryotic cell. All the three domains have very unique ribosomal RNA (rRNA). Archaea are known for their survival in very extreme conditions like high temperature, salinity, acidic conditions, etc. Bateria , thought are prokaryotes differ from Archaea in structure of cell wall.
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